From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Mon, 29 Aug 2022 11:44:57 +0200
Subject: fix: crash loading non-standard schemes in iframes

This fixes a crash that occurs when loading non-standard schemes from
iframes or webviews. This was happening because
ChildProcessSecurityPolicyImpl::CanAccessDataForOrigin contains explicit
exceptions to allow built-in non-standard schemes, but does not check
for non-standard schemes registered by the embedder.

This patch adjusts the origin calculation for non-standard schemes in
 - browser process at `NavigationRequest::GetOriginForURLLoaderFactoryUncheckedWithDebugInfo`
 - render process at `DocumentLoader::CalculateOrigin`

When top level frame navigates to non-standard scheme url, the origin is calculated
as `null` without any derivation. It is only in cases where there is a `initiator_origin`
then the origin is derived from it, which is usually the case for renderer initiated
navigations and iframes are no exceptions from this rule.

Upstream bug https://bugs.chromium.org/p/chromium/issues/detail?id=1081397.

Upstreamed at https://chromium-review.googlesource.com/c/chromium/src/+/3856266.

diff --git a/content/browser/renderer_host/navigation_request.cc b/content/browser/renderer_host/navigation_request.cc
index 22bb23e6a84d3b6686461f87e846125ad7484742..198403ec544e71f50c8555d131015b805124ce7a 100644
--- a/content/browser/renderer_host/navigation_request.cc
+++ b/content/browser/renderer_host/navigation_request.cc
@@ -10757,6 +10757,12 @@ NavigationRequest::GetOriginForURLLoaderFactoryUncheckedWithDebugInfo() {
         "blob");
   }
 
+  if (!common_params().url.IsStandard()) {
+    return std::make_pair(url::Origin::Resolve(common_params().url,
+                                               url::Origin()),
+                          "url_non_standard");
+  }
+
   // In cases not covered above, URLLoaderFactory should be associated with the
   // origin of |common_params.url| and/or |common_params.initiator_origin|.
   url::Origin resolved_origin = url::Origin::Resolve(
diff --git a/third_party/blink/renderer/core/loader/document_loader.cc b/third_party/blink/renderer/core/loader/document_loader.cc
index f8098c86def00cac76932551bf413266facdc935..98a4c1ad9f561e1bec1e6113db46d4bcf3d3f694 100644
--- a/third_party/blink/renderer/core/loader/document_loader.cc
+++ b/third_party/blink/renderer/core/loader/document_loader.cc
@@ -2264,6 +2264,10 @@ Frame* DocumentLoader::CalculateOwnerFrame() {
 scoped_refptr<SecurityOrigin> DocumentLoader::CalculateOrigin(
     Document* owner_document) {
   scoped_refptr<SecurityOrigin> origin;
+  bool is_standard = false;
+  std::string protocol = url_.Protocol().Ascii();
+  is_standard = url::IsStandard(
+      protocol.data(), url::Component(0, static_cast<int>(protocol.size())));
   StringBuilder debug_info_builder;
   // Whether the origin is newly created within this call, instead of copied
   // from an existing document's origin or from `origin_to_commit_`. If this is
@@ -2316,6 +2320,10 @@ scoped_refptr<SecurityOrigin> DocumentLoader::CalculateOrigin(
     debug_info_builder.Append(", url=");
     debug_info_builder.Append(owner_document->Url().BaseAsString());
     debug_info_builder.Append(")");
+  } else if (!SecurityOrigin::ShouldUseInnerURL(url_) &&
+             !is_standard) {
+    debug_info_builder.Append("use_url_with_non_standard_scheme");
+    origin = SecurityOrigin::Create(url_);
   } else {
     debug_info_builder.Append("use_url_with_precursor");
     // Otherwise, create an origin that propagates precursor information
